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Ah ha, a piece I didn't know. I would hope the same, yes. I saw 'PC audio' and read it as 'PC speaker'. If it really is the 8253-ish-driven speaker, it's likely a bitbanging interface. If it's a soundcard and you're getting 40/60kHz out... yikes.
Yeah, I'd expect some funky harmonics out of PC speaker tones. Would be a fun thing to record and see. Legacy ones are definitely driven via a single digital output; I wonder what happens with modern HDA setups though.
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I think for HDA there's two ways, either you feed in the i8253 signal into a pin on the codec, or the BIOS emulates the whole thing using an HDA widget to internally generate the tones inside the codec. I wonder if either or both of those approaches have band-limited output.
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Well I just tried both on my laptop. Neither is bandlimited. The i8253 path at 10kHz (i8253 -> HDA codec PCBEEP input -> line out) has harmonics up to at least 290kHz before I hit the noise floor, and the internal gen at 12kHz (HDA codec beepgen -> line out) goes beyond 1MHz (!).pic.twitter.com/QroMccNeNk
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The only guiding principle of most modern reimplementations of anything: "enh. close enough." If it's coming out a [non-audiophile] DAC that cost more than $0.10, it's bandlimited.
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